import java.util.Scanner;

public class T33 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
       /* System.out.println("请在控制台上输入分数");
        int score = scanner.nextInt();

        if (score == 90)
            System.out.println("给你一本书");
        else
            System.out.println("给你一个大🖊逗");
*/

     /*   System.out.println("请在控制台上输入0-100的这个数");
        int score = scanner.nextInt();
        if (score <= 25) {
            System.out.println("D");
        } else if (score <= 50 && score > 25) {
            System.out.println("C");

        } else if (score <= 75 && score > 50) {
            System.out.println("B");

        } else if (score <= 100 && score > 75) {
            System.out.println("A");

        }else
        System.out.println("错误");*/
       // System.out.println("请在控制台上输入名次");

        // int mingCi =scanner.nextInt();
      /*  String mingCi ="1" ;
        switch (mingCi) {
            case "1":
                System.out.println("班长");

            case "2":
                System.out.println("团支书");

            case"3":
                System.out.println("学习委员");

            default:
                System.out.println("心理委员");
        }*/

        System.out.println("请在控制台上输入月份");
        int month = scanner.nextInt();
        switch (month) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                System.out.println("本月有31天");
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                System.out.println("本月有30天");
                break;
            default:
                System.out.println("本月有28天");
        }


    }
}
